I am working in a upgrade to IOS XR (Version 3.6.2) in a 12410 box and I am having a problem with E3 link, when the other side is a 7200 router.
After the upgrade, sometimes the link becomes down, but, more frequently, I is up with CRC. The link flaps all the time. I have changed the "national bit", "framing", scramble, etc. Sometimes it works for some minutes, but we haven't found a solution.
Does anybody have experienced this problem?